The flow onto the propulsor behind a marine vehicle is a complex phenomenon due to variety of reasons such as separation of the boundary layer, presence of appendages, three-dimensional curvature at the stern of the vessel etc. For the purpose of designing wake-adapted propulsor, the nature of flow downstream in the vicinity of the propulsor is to be correctly predicted. In the recent past NSTL has pioneered work in the Naval CFD for high speed submerged vehicle applications in India At NSTL a Computational Design and Analysis System is being developed for propulsor design using computational tools. The system essentially consists of three modules. The first module consists of a 3D RANS code for incompressible flows over submerged bodies. This code predicts the flow around the body onto which the propulsor is fitted. The second module consists of a propulsor design package. The third module consists of a panel code for analysis of flow around propellers using potential or panel methods and thus prediction blade section pressures and the open water characteristics of the propeller. The results generated by this Analysis System for a High Speed underwater body with propeller, are presented in this paper.
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